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I am putting together an engine (XU10 RGX with 1.9 Mi16 cylinder head) and need a solution to fit the cylinder head to the block using studs. What I have is a set of 'custom head studs' 145 mm in length and a set of Honda F20C ARP studs (170-ish mm in length) which also happen to be M12x1.5. If I use the 145mm ones I will not have enough thread above the waterpump, the washer + nut is sticking out above the stud, this is when no head bolt spacer is used. If I use the spacers on the 9 other ones I will have the same problem (nut sticks out above stud, about 3 or 4mm). If I use the ARP Honda studs, above the waterpump I would have enough thread for the nut to hold but only if I use a headbolt spacer as the stud is too long, for the 9 other ones I would need double spacers because the nut would just fall into a place without thread (socket will be too short also). A specialist told me to always use the head bolt spacers to prevent damage to the cylinder head (ARP washer is not enough to spread the load?). I was wondering if it is safe to put double spacers or if a set exists where I can use 1 spacer per bore and not have studs too long or too short. Does anyone know a way to safely do this, maybe with the parts I already have? I have looked on the forum before and someone mentioned the 'AU6.195-2LB' single stud but I cannot find this part anywhere and I am not sure which stud set was used. Hope someone can help me, I already spent a lot of money on parts and overhaul (and time waiting for a 16v turbo manifold which took over a year to make)